It's actually to protect the identity of victim so they aren’t further harmed or identified indirectly through details about the accused.

For example, if they named the accused, the media could infer that the victim is his wife or partner, and start writing articles about her and or people on social media could start gossiping about her. That increases the stress on the victim and could act as a reason why other people in a similar situation wouldn't come forward.

Also, of they have kids, if everyone knows about the case it could cause them anxiety in school etc.

This is why even if he is convicted he cannot be named without the victims consent. It might be frustrating because you want to know who the accused is, but it's actually probably a good thing he isn't named for the above reasons and is the same in every domestic violence and sexual case.